/*
 *  Copyright 2009 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.mybatis.generator.codegen.mybatis3.xmlmapper.elements;

import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.dom.java.FullyQualifiedJavaType;
import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.TextElement;
import org.mybatis.generator.api.dom.xml.XmlElement;
import org.mybatis.generator.codegen.mybatis3.MyBatis3FormattingUtilities;
import org.mybatis.generator.config.GeneratedKey;

/**
 * 
 * @author Jeff Butler
 * 
 */
public class InsertSelectiveElementGenerator extends AbstractXmlElementGenerator {

	public InsertSelectiveElementGenerator() {
		super();
	}

	@Override
	public void addElements(XmlElement parentElement) {
		XmlElement answer = new XmlElement("insert"); //$NON-NLS-1$

		answer.addAttribute(new Attribute("id", introspectedTable.getInsertSelectiveStatementId())); //$NON-NLS-1$

		FullyQualifiedJavaType parameterType = introspectedTable.getRules().calculateAllFieldsClass();

		answer.addAttribute(new Attribute("parameterType", //$NON-NLS-1$
				parameterType.getFullyQualifiedName()));

		context.getCommentGenerator().addComment(answer);

		GeneratedKey gk = introspectedTable.getGeneratedKey();
		if (gk != null) {
			IntrospectedColumn introspectedColumn = introspectedTable.getColumn(gk.getColumn());
			// if the column is null, then it's a configuration error. The
			// warning has already been reported
			if (introspectedColumn != null) {
				if (gk.isJdbcStandard()) {
					answer.addAttribute(new Attribute("useGeneratedKeys", "true")); //$NON-NLS-1$ //$NON-NLS-2$
					answer.addAttribute(new Attribute("keyProperty", introspectedColumn.getJavaProperty())); //$NON-NLS-1$
				} else {
					answer.addElement(getSelectKey(introspectedColumn, gk));
				}
			}
		}

		StringBuilder sb = new StringBuilder();

		sb.append("INSERT INTO "); //$NON-NLS-1$
		sb.append(introspectedTable.getFullyQualifiedTableNameAtRuntime());
		answer.addElement(new TextElement(sb.toString()));

		XmlElement insertTrimElement = new XmlElement("trim"); //$NON-NLS-1$
		insertTrimElement.addAttribute(new Attribute("prefix", "(")); //$NON-NLS-1$ //$NON-NLS-2$
		insertTrimElement.addAttribute(new Attribute("suffix", ")")); //$NON-NLS-1$ //$NON-NLS-2$
		insertTrimElement.addAttribute(new Attribute("suffixOverrides", ",")); //$NON-NLS-1$ //$NON-NLS-2$
		answer.addElement(insertTrimElement);

		XmlElement valuesTrimElement = new XmlElement("trim"); //$NON-NLS-1$
		valuesTrimElement.addAttribute(new Attribute("prefix", "values (")); //$NON-NLS-1$ //$NON-NLS-2$
		valuesTrimElement.addAttribute(new Attribute("suffix", ")")); //$NON-NLS-1$ //$NON-NLS-2$
		valuesTrimElement.addAttribute(new Attribute("suffixOverrides", ",")); //$NON-NLS-1$ //$NON-NLS-2$
		answer.addElement(valuesTrimElement);

		for (IntrospectedColumn introspectedColumn : introspectedTable.getAllColumns()) {
			if (introspectedColumn.isIdentity()) {
				// cannot set values on identity fields
				continue;
			}

			if (introspectedColumn.isSequenceColumn() || introspectedColumn.getFullyQualifiedJavaType().isPrimitive()) {
				// if it is a sequence column, it is not optional
				// This is required for MyBatis3 because MyBatis3 parses
				// and calculates the SQL before executing the selectKey

				// if it is primitive, we cannot do a null check
				sb.setLength(0);
				sb.append(MyBatis3FormattingUtilities.getEscapedColumnName(introspectedColumn));
				sb.append(',');
				insertTrimElement.addElement(new TextElement(sb.toString()));

				sb.setLength(0);
				sb.append(MyBatis3FormattingUtilities.getParameterClause(introspectedColumn));
				sb.append(',');
				valuesTrimElement.addElement(new TextElement(sb.toString()));

				continue;
			}

			XmlElement insertNotNullElement = new XmlElement("if"); //$NON-NLS-1$
			sb.setLength(0);
			sb.append(introspectedColumn.getJavaProperty());
			sb.append(" != null"); //$NON-NLS-1$
			insertNotNullElement.addAttribute(new Attribute("test", sb.toString())); //$NON-NLS-1$

			sb.setLength(0);
			sb.append(MyBatis3FormattingUtilities.getEscapedColumnName(introspectedColumn));
			sb.append(',');
			insertNotNullElement.addElement(new TextElement(sb.toString()));
			insertTrimElement.addElement(insertNotNullElement);

			XmlElement valuesNotNullElement = new XmlElement("if"); //$NON-NLS-1$
			sb.setLength(0);
			sb.append(introspectedColumn.getJavaProperty());
			sb.append(" != null"); //$NON-NLS-1$
			valuesNotNullElement.addAttribute(new Attribute("test", sb.toString())); //$NON-NLS-1$

			sb.setLength(0);
			sb.append(MyBatis3FormattingUtilities.getParameterClause(introspectedColumn));
			sb.append(',');
			valuesNotNullElement.addElement(new TextElement(sb.toString()));
			valuesTrimElement.addElement(valuesNotNullElement);
		}

		if (context.getPlugins().sqlMapInsertSelectiveElementGenerated(answer, introspectedTable)) {
			parentElement.addElement(answer);
		}
	}
}
